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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
S7Z - Extension Details
Date Added: January 01, 1970
File Extension:  .S7Z
Description 1: The .S7Z extension refers to a file archive that is compressed by 7zX for the Macintosh by means of 7Zip compression. It is a filetype capable of retaining Spotlight metadata, owner and group permissions, resource forks, as well as other Macspecific data that have a good chance of being lost in Windows compression.
File Type:   Archive/Compressed file
Mode: Binary
Program(s) to Open:  Macintosh: Sixty Five, Ltd. 7zX
Common:
Extension: